Federal regulators have cleared the way for the first human trials of human embryonic stem-cell research, authorizing researchers to test whether the cells are safe to use in spinal injury patients, the company behind the trials announced Friday. The tests could begin by summer, said Dr. Thomas Okarma, president and CEO of the Geron Corporation. The Food and Drug Administration has approved the trials, which will use human stem cells authorized for research by then-President George W. Bush in 2001. The patients will be those with the most severe spinal cord injuries, called complete spinal cord injuries. ‘A complete spinal cord injury has no hope of recovery below the injury,’ Okarma told CNN. ‘This is significant because it’s the first clinical trial of a human embryonic-based product.’ The primary purpose of the trial will be to see whether injecting these cells into patients is safe, but Okarma said researchers will also look for any signs of recovery. Scientists will monitor the patients for a year after the injections to see if they are regaining any function below the injured point. ‘If there is any movement below the injury, they will measure that and record it,’ […]